Now, a leading scientist says the numbers don't add up.  Ken Ham, President of Answers in Genesis told IRN News' John Russel that at the time that scientists believe the asteroid strike occurred, 85 percent of all dinosaurs were already extinct.   Ham says that one of the reasons scientists believe that an asteroid caused the extinction of the dinosaurs is the presence of a substance known as Iridium, which is present in the ground.  He says that while it's widely thought that the Iridium traces were delivered by space debris, there are actually two sources of the material:

"It could come from asteroids, anotherwords, from outer space, or something like that, an asteroid impact, 'cause it's a rare element on Earth, or it can actually come from volcanic eruptions.  And, it's interesting, there's a lot of evidence of a lot of post-flood volcanic eruption all over the Earth, so, what evolutionists interperet as, you know, this boundary and where the dinosaurs supposedly became extinct, ahh, because of this Iridium lag could also be interpereted as maybe the last stages of Noah's flood". 

Ham points out that scientists have been pushing their asteroid strike and time line as historic fact for years, but now they suddenly have decided to move the timeline back 300,000 years.  Notes Ham, "....that's one thing you'll notice about evolutionary ideas, people keep changing their minds all the time yet at the time they are presenting something, they present it as fact." 

An interesting observation, since the same statement would apply to the theory of so-called global warming.  In the early 1980s, some scientists were overheard warning about the coming ice age.  Somewhere between then and now, science has changed it's mind, again.

Ham has a Batchelor's degree in Applied Science from the Queensland Institute of Technology, and is the President of  "Answers in Genesis".